Combined seaming and pinking machine



April 16, 1935.

S. G. TATE COMBINED SEAMING AND PINKING MACHINE Filed Sept. 10, 1954 2 Sheets-Sheet 1 April 16, 1935. s. G. TATE 1,998,030

COMBINED SEAMING AND PINKING MACHINE Filed Sept. 10, 1934 2 Sheets-Sheet 2 Patented Apr. 16, 1935 UNITED STATES PATENT" OFFICE COMBINED SEAMING AND PINKING MACHINE Samuel George Tate, Washington, D. 0., assignbr to Lewis Invisible Stitch Machine Company, St. Louis, Mo., a corporation of Maine Application September 10, 1934, Serial No. 743,445

4 Claims.

bodies certain improvements on the construction disclosed in the Mann Patent 1,962,022 issued June 5, 1934, for Improvements in combined seaming and pinking machines.

Among the several objects of my invention are to provide a simple and novel means for alternately reciprocating the movable knives; to provide a pinking mechanism which can be readily attached to any sewing machine, and to provide means for imparting frictional contact between the ledger blades and the movable knives without creating unnecessary pressure between the depending portions of the knives and the ledger blades.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawings.

In the drawings:- I,

Figure l is a front elevation of a combined seaming and pinking machine constructed in accordance with my invention,

Figure '2 is a vertical transverse sectional view thereof,

Figure 3 is a partial plan view of the machine base showing the pinking mechanism mounted thereon,

Figure 4 is a plan view of the reduction gear unit employed in alternately reciprocating the movable knives, and

Figure 5 is a detail sectional view taken on the line 5-5 of Figure 1.

Like reference numerals designate corresponding parts throughout the several figures of the drawings.

In the drawings, I have illustrated a conventional sewing machine which includes a work supporting base, 5, a standard 6, and a hollow overhanging arm I wherein is journaled a main rotary shaft 8. A vertically reciprocatory needle bar 9 is mounted in the end of the overhanging arm I and carries a needle III, the needle bar being given one complete reciprocation by the main shaft during every rotation or cycle thereof. Also supported on the end of the arm I is a presser foot II. The usual intermittent feed dog I2 is mounted in the base 5 for cooperation with the foot to feed the material up to and past the needle.

A base plate I3 is slotted as at I 4 to receive clamp screws l5 by which it is removably and adjustably attached to the work supporting base 5,'as shown in Figure 3. Formed in the base 5 at the right of the needle, is an opening l6 and formed in the base plate I3 is an opening I! which 5 registers with the opening Hi. The openings receive the pinking knives and also provide clearance therefor.

The pinking or trimming elements comprise two stationary or ledger blades l8, l8 and two cooperating vertically movable knives l9, I9. The ledger blades l8 are attached to the base plate l3 at opposite sides of the opening H, the blades being arranged at an angle to each other and the cutting edges 20, 20 thereof forming two sides of a triangular opening, the apex thereof being located just to the right of the needle. Each knife includes a cutting edge 2| and a portion or toe 22 which depends below the cutting edge. These knives l9, H) are mounted in the ends of knife arms 23, 23 which are fulcrumed to swing about horizontal axes-arranged at substantially right angles to the cutting edges 20 of the ledger blades l8. To this end, each knife arm is fixed to a pivot shaft 24 which is mounted for longitudinal movements in spaced inner and outer bearing bushings 25, 26 mounted in the base plate iii. The longitudinal axis of each arm is disposed at a slight obtuse angle to the cutting edge of the associated ledger blade in order to obtain a shear cut. The inner end of each pivot shaft 24 is reduced to form a resultant annular shoulder 21 and disposed around this reduced end is a coil spring 28. The inner end of the bushing 25 is interiorly threaded for engagement by an adjusting nut 29, the inner end of the pivot shaft being slidable therein and relatively thereto. Thus by means of the nut 29, the tension of the spring 28 may be varied to thereby vary the pressure of the associated knife I!) against the cooperating ledger blade I8.

Attached rigidly to the shaft 8 between the needle I0 and the standard 6 is a. relatively small spur gear 30, and the overhanging arm I is cutaway on its under side as at 3| to form an opening which registers with said gear. Attached to the under side of the overhanging arm is a bracket 32 in which is journaled a countershaft 33 which extends in parallelism with the shaft 8 and isdisposed directly therebelow. A relatively large spur gear 34 is fixed to one end of the countershaft 33 and is in constant mesh with the relatively small spur gear 30. Preferably the gear ratio is 1-to-2 whereby the countershaft will be rotated once to every two revolutions of the main 5 shaft. Secured to the countershaft 33 above the knife arms 23. 23 are ball eccentrics 35, 35 which are timed 180 apart. Extending upwardly from the knife arms 23, 23 are ears 36, 36 and fixedly secured to these cars are balls 31, 31. Two links 38, 38 are directly connected at their upper ends to the eccentrics 35 and at their lower ends to the balls 31.

From the foregoing, it will be observed that the knives I9 are alternately reciprocated from the main shaft 8 through driving connections which include a countershaft, a reduction gear coupling said shafts, and two driven eccentrics which are directly connected to the knife arms 23 by links 38; that the knife driving means is so timed that the knives are alternately reciprocated in timed relation to the needle reciprocations; and that the pinking attachment may be readily applied to conventional sewing machines with but very little expense in preparing the machine to receive the attachment.

It is of course to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of my invention.

I claim:

1. In a combined seaming and pinking machine, the combination with a frame including a base, a standard, and an overhanging arm, of a rotary shaft journaled in said arm, a vertically reciprocatory needle mounted at the end of said arm and having driving connections with said shaft, and means for cutting pinks in a fabric in timed relation to the needle reciprocations including a" pair of ledger blades mounted on the base at the side of the needle towards the standard and arranged at an angle to each other, a pair of knives supported on the base for vertical reciprocations and for cooperation with the ledger blades, and driving connections between the knives and the rotary shaft for alternately reciprocating said knives comprising a reduction gear unit including a driving gear fixed on the rotary shaft between the standard and the free end of said overhanging arm, and separate driving comiections between the knives and the reduction gear unit including a countershaft extending in parallelism with the rotary shaft and two driven eccentrics timed 180 apart and mounted on said overhanging arm, and links connecting the eccentrics and the knives.

2. In a combined seaming and pinking machine, the combination with a frame including a base, a standard, and an overhanging arm, of a rotary shaft journaled in said arm, a vertically reciprocatory needle mounted at the end of said arm and having driving connections with said shaft, and means for cutting pinks in a fabric in timed relation to the needle reciprocations including a pair of ledger blades mounted on the base at the side of the needle towards the standard and arranged at an angle to each other, a pair of knives supported on the base for vertical reciprocations and for cooperation with the ledger blades, and driving connections between the knives and the rotary shaft for alternately reciprocating said knives comprising a reduction gear unit including a countershaft supported on the overhanging arm and extending in parallelism with the rotary shaft, a driven gear fixed on the countershaft and meshing with the driving gear, and separate driving connections between the countershaft and the knives including two eccentrics fixed on the countershaft and timed 180 apart, and links connecting the eccentrics and the knives.

3. In a combined seaming and pinking machine, the combination with a frame including a base, a standard, and an overhanging arm, of a rotary shaft journaled in said arm, a vertically reciprocatory needle mounted at the end of said "arm and having driving connections with said shaft, and means for cutting pinks in a. fabric in timed relation to the needle reciprocations including a pair of ledger blades mounted on the base at the side of the needle towards the standard and arranged at an angle to each other, a pair of knives supported on the base for vertical reciprocations and for cooperation with the ledger blades, and driving connections between the knives and the rotary shaft for alternately reciprocating said knives comprising a reduction gear unit including a countershaft supported on the overhanging arm and extending in parallelism with and located directly below the rotary shaft, a relatively small driving spur gear fixed on the rotary shaft, a relatively large driven spur gear fixed to the countershaft and meshing with the driving spur gear, said arm being cut away to receive the driven gear, two eccentrics fixed on the countershaft intermediate the needle and the gears and timed 180 apart, and links connecting the eccentrics and the knives.

4. In a combined seaming and pinking machine, the combination with a frame including a base, a standard, and an overhanging arm, of a rotary shaft journaled in said arm, a vertically reciprocatory needle mounted at the end of said arm and having driving connections with said shaft, and means for cutting pinks in a fabric in timed relation to the needle reciprocations including a pair of ledger blades mounted on the base at the side of the needle towards the standard and arranged at an angle to each other, a pair of knife arms fulcrumed on the base on horizontal axes arranged at substantially right angles to the cutting edges of the ledger blades, knives respectively secured to the arms for cooperation with the ledger blades, and driving connections between the knife arms and the rotary shaft for alternately reciprocating said knives comprising a countershaft supported on the overhanging arm and extending in parallelism with and located directly below the rotary shaft, a relatively small driving spur gear fixed on the rotary shaft, a relatively large driven spur gear fixed to the countershaft and meshing with the driving spur gear, said arm being cut away to receive the driven gear, two eccentrics fixed on the countershaft intermediate the needle and the gears and timed 180 apart, and links directly connecting the eccentrics and the knife arms.

SAMUEL GEORGE TATE. 

